Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual são todos os u15 3º iv com u15 4º iv sendo bbc
 ###Tabelas: CREATE TABLE winning_head_of_the_river_championship_events (winning_head_of_the_river_championship_events_id AUTO_INCREMENT PRIMARY KEY, Crew INT, Open 1st VIII VARCHAR, Open 2nd VIII VARCHAR, Open 3rd VIII VARCHAR, U16 1st VIII VARCHAR, U16 2nd VIII VARCHAR, U16 3rd VIII VARCHAR, U15 1st IV VARCHAR, U15 2nd IV VARCHAR, U15 3rd IV VARCHAR, U15 4th IV VARCHAR, U15 5th IV VARCHAR, U15 6th IV VARCHAR) CREATE TABLE european_records (european_records_id AUTO_INCREMENT PRIMARY KEY, Competition VARCHAR, Appearances INT, Played INT, Drawn INT, Lost INT, Goals for INT, Goals against INT) CREATE TABLE 250_nm (250_nm_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Frequency VARCHAR, L2 cache VARCHAR, Mult. VARCHAR, Voltage VARCHAR, Socket VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR) CREATE TABLE color_standards (color_standards_id AUTO_INCREMENT PRIMARY KEY, NTSC M VARCHAR, PAL B,G,H VARCHAR, PAL I VARCHAR, PAL N VARCHAR, PAL M VARCHAR) CREATE TABLE match_details (match_details_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, League position VARCHAR, Opponents VARCHAR, Venue VARCHAR, Result VARCHAR, Score F–A VARCHAR, Attendance INT)  
SELECT U15 3rd IV FROM winning_head_of_the_river_championship_events WHERE U15 4th IV = BBC